Pump valve piston



FIG. 1 is a perspective view of my pump valve piston;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a right side elevational view thereof;

FIG. 8 is a sectional view taken generally along sectional lines 8—8 of FIG. 4; and,

FIG. 9 is a section view taken generally along sectional lines 9—9 of FIG. 4. 

The ornamental design for a pump valve piston, as shown and described. 